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Answer Key Progress Test Complete First Second Edition Cambridge University Press 2014 By Guy Brook-Hart
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BFC 21702
CONFIDENTIAL
UNIVERSITI TUN HUSSEIN ONN MALAYSIA
ANSWER SCHEME - TEST I SEMESTER II SESSION 2014/2015 COURSE NAME
:
GEOTECHNICS I
COURSE CODE
:
BFC 21702
PROGRAMME
:
2 BFF
EXAMINATION DATE
:
MARCH 2015
DURATION
:
1 HOUR AND 30 MINUTES
INSTRUCTION
:
ANSWER ALL QUESTIONS
THIS QUESTION PAPER CONSISTS OF TEN (10) PAGES
CONFIDENTIAL 1
BFC 21702
Q1
(a)
(i) Define the transported soil. List three major types of t ransported soils and described how each is formed. Answer: The transported soil are formed by the deposition of sediments that have been transported from their places of origin by various agent. (1 mark) Types of transported soil 1. Glacial soils- formed by transportation and deposition of glaciers 2. Alluvial soils – Transported by running water and deposited along stream Any 3. Lacustrine soils – fromed by deposition in quiet lakes three 4. Marine soils – formed by deposition in the seas 5. Aeolian soils – formed by transported and deposited by wind 6. Colluvial soils – formed by movement of soil by gravity (3 marks) (ii) The amount of moisture content in the fine gra in soil will influence their characteristic. Explain briefly the liquid state, plastic state, sem isolid state and solid state of the soil. Answer: Liquid state – the soil able to flow as liquid Plastic state – the soil can be molded into any desired shape without rupture Semisolid state- the soil cannot be molded without visible cracks appearing Solid state – the soil become solid and no further volume change occurs since all the water in the soil has been removed. (4 marks)
(b)
Sieve and hydrometer analysis have been performed on a soil sample from Kahang, Kluang Johor. The results of this test are shown in Figure Q1. (i)
Determine the percentage of gravel, sand, silt and clay of the soil sample according to AASHTO classification system. Answer: From Figure Q1; % gravel = 100 – 97 = 3% % sand = 97 – 58 = 39% % silt = 58 – 47 = 11% % clay = 47 – 0 = 47% (4 marks)
2
BFC 21702
(ii)
Estimate the effective size, the coefficient of uniformity and the coefficient of gradation of the soil sample. Answer: Effective size, D 10 = 0
(1 mark)
D30 = 0
(1 mark)
D60 = 0.09
(1 mark)
coefficient of uniformity, C u =
coefficient of gradation, Cc =
(iii)
D60 D10
=
( D30 )
0.09 0
2
D10 ´ D60
=
=0
( 0)
(1 mark) 2
0 ´ 0.09
=0
(1 mark)
From the Atterberg limit test, the liquid limit (LL) is 26% and plastic limit (PL) is 14%. If the sieve size of the sieve No. 10, No. 40 and No. 200 are 2.0 mm, 0.425 mm and 0.075 mm respectively, classify the soil according to AASHTO soil classification system. Show your steps of classification in detail. Answer: From Figure Q1, % passing at No. 200 sieve = 76% more than 35%, so refer to Silt-clay material table. (2 marks) Possibility of the groups are A-4, A-5, A-6 and A-7.
(2 mark)
Given the LL = 26% and PL = 14%. Base on the Atterberg limit a nd Table Q1, group A-6 is suitabale for the given data. (4 marks)
3
BFC 21702
Q2
(a)
Briefly explain with the aid of sketches what are three phase diagram and two phase diagrams that normally used in determining weight volume relationship. (6 marks) Answer:Three phase diagram for partially saturated co ndition. Two phase diagrams for saturated and dry conditons.
[3 x 2M = 6M] (b)
Please derive that the moist unit weight of soil in the follwing form. γmoist =
(Gs + e.Sr ) 1+ e
γw
(4 marks)
Answer:-
4
BFC 21702
(c)
3
The wet unit weight of a soil sample is 18.55 kN/m . Its specific gravity of solids and water content are 2.72 and 12.3%, resp ectively. Determine the: (i)
3
dry unit weight (kN/m ) (5 marks)
Answer:-
5
BFC 21702
(ii)
void ratio, e (5 marks)
Answer:-
6
BFC 21702
(iii)
degree of saturation. (5 marks)
Answer:-
-
END OF QUESTION -
7
BFC 21702
TEST I SEMESTER / SESSION : SEM II / 2014/2015 COURSE : GEOTECHNICS I
CLAY
PROGRAMME : 2 BFF COURSE CODE : BFC 21702
Coarse
Fine
SILT
SAND
GRAVEL
Figure Q1: Particle size distribution of Kahang, Kluang soil sample
Soil Classification
PI = LL - PL Cu = Cc =
D60 D10
( D30 )
2
D 10 ´D 60
8
BFC 21702
TEST I SEMESTER / SESSION : SEM II / 2014/2015 COURSE : GEOTECHNICS I
PROGRAMME : 2 BFF COURSE CODE : BFC 21702
TABLE Q1: AASHTO Soil Classification System
9
BFC 21702
TEST I SEMESTER / SESSION : SEM II / 2014/2015 COURSE : GEOTECHNICS I
PROGRAMME : 2 BFF COURSE CODE : BFC 21702
TABLE Q2: Various forms of relationship for g, gd and gsat
